l4955 STMicroelectronics, l4955 Datasheet
l4955
Available stocks
Related parts for l4955
l4955 Summary of contents
Page 1
... LOW COST SOLUTION FOR 5V TO 3.3V CONVERSION LOW COST BATTERY CHARGER CONSTANT CURRENT REGULATOR SUITABLE FOR APPLICATION STANDBY FEATURE DESCRIPTION The L4955 is a family of monolithic ultra very low drop linear regulators designed to supply the most recent microprocessors. TYPICAL APPLICATIONS INH PG IN OUT 3 ...
Page 2
... L4955 ABSOLUTE MAXIMUM RATINGS Symbol V Supply Input Voltage IN ADJ and CL pins PG and INH pins P Power Dissipation @ T TOT amb Power Dissipation @ T case Storage Temperature st i PIN CONNECTIONS (Top views tab connected to pin 4 D96IN367 HEPTAWATT BLOCK DIAGRAM 1( ...
Page 3
... Regulated output voltage. A minimum bypass capacitor required to insure stability. THERMAL DATA (HEPTAWATT & VERSAWATT packages) Symbol R Thermal Resistance Junction-case th j-case R Thermal Resistance Junction-ambient th j-amb Thermal Shutdown Thermal Hysteresis L4955 - ELECTRICAL CHARACTERISTICS (T = Specifications referred to T from +125 C. J Symbol Parameter V Operating Supply Voltage IN V Output Voltage (1) 0.1A < ...
Page 4
... Load regulation 0.1A < IO < Current Limiting O Short Circuit Current V I Quiescent Current 0.1A < Ripple Rejection f = 120Hz L4955V5.1 - ELECTRICAL CHARACTERISTICS (T = Specifications referred to T from +125 C. J Symbol Parameter V Operating Input Voltage IN V Output Voltage 6.75V < 6.75V < Drop-out Voltage ...
Page 5
... Figure 1: L4955 DC Operating Area O u tput C ur rent [ > 4. urr ent Lim itation 125 dson Pow sipation Lim it 4 lim 40W perating 22W ...
Page 6
... 6/14 L4955 Figure 8: Quiescent Current vs. Temperature ( ...
Page 7
... Figure 15: Inhibit Function V INH Vref = 1.26V regulator ON L4955 Figure 14: Power Good Function V ADJ 0.9 V ADJ PG Low High 4 5 hyst = 200mV t regulator regulator OFF ON D96IN365A L4955 V =V (R1+R2)/R2 OUT ADJ hyst = 200mV t Low t D96IN364B t 7/14 ...
Page 8
... L4955 LINE TRANSIENT RESPONSE Figure 16. Figure 17. Figure 18. Test condition : V = 12V 1V (electrolytic capacitor); dV/ out 8/14 = 3.3V 200mA (electrolytic capacitor ...
Page 9
... Figure 22: Load transient test circuit VIN = L4955 C1, 470 F/25V Panasonic CL GND HFQ Figure 20. dI out OUT 7 R4 910 ADJ 100 F/10V R5 AVX TPS INH 560 6 each D97IN546 L4955 VOUT = 3.3V C10 to C15 1 F AVX X7R 6 each 9/14 ...
Page 10
... V < < 3 2.5 2 1.5 1 0 10/14 L4955V3.3 Figure 24: Output Voltage Stability vs. Junction Temperature . . Figure 26: Load Regulation ...
Page 11
... [A] Figure 34: Maximum OutputCurrent vs. Junction Temperaturewith internalcurrent limiting O utput C urrent [ (Vin-Vout) > pin -40 - ulsed tecnique ha s been used L4955 100 120 140 160 11/14 ...
Page 12
... L4955 mm inch DIM. MIN. TYP. MAX. MIN. TYP. A 4.8 C 1.37 D 2.4 2.8 0.094 D1 1.2 1.35 0.047 E 0.35 0.55 0.014 E1 0.7 0.97 0.028 F 0.6 0.8 0.024 F1 0.9 G 2.34 2.54 2.74 0.095 0.100 G1 4.88 5.08 5.28 0.193 0.200 G2 7.42 7.62 7.82 0.295 0.300 H2 10.4 H3 10.05 10.4 0.396 L 16.7 16.9 17.1 0.657 0.668 0.673 L1 14.92 0.587 L2 21.24 21.54 21.84 0.386 0.848 L3 22.27 22.52 22.77 0.877 0.891 L4 1.29 L5 2.6 2.8 3 0.102 0.110 L6 15.1 15.5 15.8 0.594 0.610 0.622 L7 6 6.35 6.6 0.236 0.250 0.260 L9 0 ...
Page 13
... F 0.61 0.88 0.024 F1 1.14 1.70 0.044 F2 1.14 1.70 0.044 G 4.95 5.15 0.194 G1 2.40 2.70 0.094 H2 10.0 10.4 0.393 L2 16.4 0.645 L4 13.0 14.0 0.511 L5 2.65 2.95 0.104 L6 15.25 15.75 0.600 L7 6.20 6.60 0.244 L9 3.50 3.93 0.137 M 2.6 0.102 Dia 3.75 3.85 0.147 OUTLINE AND MAX. MECHANICAL DATA 0.181 0.051 0.107 0.027 0.034 0.067 0.067 0.203 0.106 0.409 0.551 0.116 0.620 0.260 0.154 Versawatt (TO220) 0.151 L4955 TO220MEC 13/14 ...
Page 14
... L4955 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice ...